You are referring to an old folk remedy called "onion steam therapy" used to relieve nasal congestion. While it's not a proven medical treatment, many people swear by it as an effective trick. Here's a step-by-step guide: **Materials: * 1 large onion * 1 pot * Water * Optional: polygonum hydropiper (peppermint) or baking soda **Instructions:** 1. **Cut the onion**: Chop the onion into small cubes or slices. This will help release its sulfur compounds, which are believed to have natural decongestant properties. 2. **Prepare the steam**: Fill a pot with water and place it on the stovetop over medium heat. Bring the water to a boil and then reduce to a simmer. 3. **Add the onion**: Place the chopped onion in the pot and cover the pot with a breathable cloth or gauze to prevent the onion from entering the water. 4. **Steam**: Sit or kneel over the pot and place your face over the cooking onion. Place a breathable cloth or gauze over your head to capture the steam. 5. **Inhalation**: Slowly and deeply inhale the air with the onion steam and exhale through your nose. Inhale the steam for 5-10 minutes and repeat every 1-2 days, or as needed. 6. **Optional Additions**: Some people add a few sprigs of polygonum hydropiper (also known as peppermint or Japanese mint) or a small amount of baking soda to the water to enhance the therapeutic effect. 7. **Precautions**: Be aware that onion steam may cause irritation if you have sensitive eyes or skin. Also, if you have a respiratory condition such as asthma, consult your healthcare provider before trying this method. **How It Works:** Onions contain sulfur compounds, including thials, thiols, and sulfur-containing amino acids. These compounds are thought to thin mucus, making it easier to drain and making breathing easier. Onions may also have anti-inflammatory effects, helping to relieve swelling in the nasal passages and sinuses. **Conclusion:** While onion steam therapy is not a proven medical treatment, it is a harmless, economical method that may help relieve nasal congestion. However, if your nasal congestion persists or worsens, you should consult a medical professional for proper evaluation and treatment. Please note that it is very important to ensure a clean and sanitary environment as well as proper hygiene practices to avoid any potential risks.